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Several major reasons why the dry part of the paper machine broke its head

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Several major reasons why the dry part of the paper machine broke its head

Release date:2018-06-11 Author:山东海天造纸机械有限公司 Click:

  

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Enter the wet paper in the dry section, the dry degree has reached more than 32%, with a certain strength. But in the dry part will also appear severed head phenomenon.



The reasons for the fracture can be as follows:



1) the strength of the page itself is insufficient or there are weak points



When the moisture of the paper is too large and the knot head of dry cloth is irregular, it is easy to press the knot head mark on the paper, causing the weak point and breaking the head of the paper page.



In the pressing section, the broken head occurs when the tension is large at the later stage of drying, or there are horizontal cracks on the wet part of the paper, as well as holes.



When the quantitative fluctuation of the paper page occurs, the drying speed will be inconsistent, and the quantitative small part of the paper page will dry quickly. Therefore, it is easy to dry and make the paper page shrink too much, and break the head at the dry end. When this happens, it should be addressed for specific reasons.



2) the tension of the paper page is too high, resulting in a broken head



There are two reasons for excessive page tension:



The first is that the transmission ratio between each set of dryers is too large. When the paper page is closed violently in the late drying period, there will be a break in the head, or there will be problems in the transmission parts, such as belt slippage and irregular gears. Therefore, it is important to adjust the tension between each dryer and pay attention to the working decorations of transmission at any time.



The second is that the temperature of the dryer is too high, and the above serious cylinder fracture will occur at the initial stage of drying, and in the process of drying, it will cause excessive drying of the paper page, making the paper page shrink violently and break the head. Sometimes even break a long time, due to a long time not to transfer heat to the paper page, so that the cylinder temperature rises high, and when the paper delivery operation, this will also happen.



Therefore, the drying part should pay attention to the temperature change of steam pressure and dryer at any time.



3) debris in the dryer caused the paper page to break



When there is a break when there is a clean damaged paper, along with the paper through the dry cloth and dryer between, easy to break the paper pad and break the head; When the scraper is not strict and leakage of paper foam, it is easy to stick to the edge of the paper. Some of the viscous materials in the paper materials brought by the damaged paper will also stick to the cylinder surface causing the fracture. Therefore, after the head is cut off, pay attention to using compressed air to clean up the damaged paper, at the same time, pay attention to removing the paper foam at the scraper, and pay attention to the working condition of the scraper.



4) the severed head caused by dry cloth



The drapery pleats will cause the corresponding paper pages of the pleats to be badly dried due to bad contact with the dryer, causing it to break between the dryer and the calender. The dry cloth joints are rough, easy to crush the paper, resulting in a broken head; There is oil and resin on the dry cloth, which will break the paper. Even the canvas side open line, swing to and fro, will also open the edge of the paper, resulting in the full width of the head. Therefore, in the normal work, we should observe the dry cloth working condition at any time, find out the problem and solve it in time.


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